Derivative Financial Instruments - Schedule of Location and Fair Value Amounts of All Derivative Instruments (Details) - Derivatives Not Designated as Hedging Contracts - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative asset - current \| Commodity contracts
Derivative Asset [Abstract]
Gross Recognized Assets	$ 990	$ 11,071
Gross Amounts Offset, Assets	(794)	(3,562)
Total financial assets	196	7,509
Derivative liability - current \| Commodity contracts
Derivative Liability [Abstract]
Gross Recognized Liabilities	25,678	4,492
Gross Amounts Offset, Liabilities	(794)	(3,562)
Total financial liabilities	24,884	930
Derivative liability - current \| Interest rate swaps
Derivative Liability [Abstract]
Gross Recognized Liabilities	179	205
Gross Amounts Offset, Liabilities	0	0
Total financial liabilities	179	205
Derivative asset - noncurrent \| Commodity contracts
Derivative Asset [Abstract]
Gross Recognized Assets	1,152	396
Gross Amounts Offset, Assets	(117)	0
Total financial assets	1,035	396
Derivative asset - noncurrent \| Interest rate swaps
Derivative Asset [Abstract]
Gross Recognized Assets	460	0
Gross Amounts Offset, Assets	0	0
Total financial assets	460	0
Derivative liability - noncurrent \| Commodity contracts
Derivative Liability [Abstract]
Gross Recognized Liabilities	2,683	0
Gross Amounts Offset, Liabilities	(117)	0
Total financial liabilities	2,566	0
Derivative liability - noncurrent \| Interest rate swaps
Derivative Liability [Abstract]
Gross Recognized Liabilities	0	173
Gross Amounts Offset, Liabilities	0	0
Total financial liabilities	$ 0	$ 173

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